Add validation for empty reference name

Author: Pietrorossellini

ReferenceLibrary/src/main/java/referencelibrary/ui/command/AddReferenceCommand.java

@@ -23,15 +23,19 @@ abstract class AddReferenceCommand extends Command {
     private void setReferenceName(Reference reference) { 
         this.fieldValidator = new FieldValidator(reference);
         while(true) {
-            String referenceName = io.readLine("Refererence id");
-            if (fieldValidator.ReferenceNameIsUnique(
-                    referenceName, app.listReferences())) {
+            String referenceName = io.readLine("Reference id");
+            if (!fieldValidator.referenceNameIsUnique(referenceName, app.listReferences())) {
+                io.print("There already exists a reference with the name " + referenceName
+                        + "\nReference name must be unique.");
+            }
+            else if (!fieldValidator.referenceNameIsNotEmpty(referenceName)) {
+                io.print("Reference name should not be empty.");
+            }
+            else {
                 reference.setReferenceName(referenceName);
                 break;
             }
-            io.print("There already exists a reference with the name " + referenceName
-            + "\nReference name must be unique.");
-        } 
+        }
     }
     /**
      * Prompts for reference fields, checks for duplicate reference names and stores the reference.

ReferenceLibrary/src/main/java/referencelibrary/util/FieldValidator.java

@@ -37,10 +37,14 @@ public boolean fieldValueIsValid(String fieldValue) {
         return true;
     }
 
-    public boolean ReferenceNameIsUnique(String referenceName, List<Reference> referenceList) {
+    public boolean referenceNameIsUnique(String referenceName, List<Reference> referenceList) {
         for (Reference reference : referenceList) {
             if(reference.getReferenceName().equalsIgnoreCase(referenceName)) return false;
         }
         return true;
     }
+
+    public boolean referenceNameIsNotEmpty(String referenceName) {
+        return referenceName.trim().length() > 0;
+    }
 }

ReferenceLibrary/src/test/java/referencelibrary/util/FieldValidatorTest.java

@@ -62,7 +62,14 @@ public void testFieldValueIsValid() {
     public void testRefereceNameIsUnique() {
         ArrayList<Reference> references = new ArrayList();
         references.add(reference);
-        assertEquals(true, fieldValidator.ReferenceNameIsUnique("newBook", references));
-        assertEquals(false, fieldValidator.ReferenceNameIsUnique("book", references));
+        assertEquals(true, fieldValidator.referenceNameIsUnique("newBook", references));
+        assertEquals(false, fieldValidator.referenceNameIsUnique("book", references));
+    }
+
+    @Test
+    public void testReferenceNameIsNotEmpty() {
+        String empty = "", whitespace = " ";
+        assertFalse(fieldValidator.referenceNameIsNotEmpty(empty));
+        assertFalse(fieldValidator.referenceNameIsNotEmpty(whitespace));
     }
 }